Pogo stick



FIG. 1 is a front perspective view of a pogo stick showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof, the opposite side being a mirror image; and

FIG. 5 is a side elevational view thereof, the opposite side being a mirror image. 

The ornamental design for a pogo stick, as shown and described. 